Standard fixes for missing menu commands:
Make sure you didn't accidentally turn on "Word 5.1 Menus". Look under
View to see if there's a check next to that option. If that isn't the
problem:
If you go to Tools | Customize Toolbars/Menus, select the Menu Bar, and
click Reset, it should set all your main menus and built-in toolbars
back to the default.
If you have customized your menus or toolbars, you may want to explore
the Tools | Customize, Commands dialog, and drag the commands you are
missing back to the toolbars/menus yourself, rather than wipe out your
customizations by clicking Reset.